It is not surprising that developers and owners of construction companies gave money to conservative candidates (they may have contributed to more than one conservative candidate). They are hoping for work and lower taxes. What, you think they care about the arts or libraries or the environment??
As for the road work companies, I think they are the ones who really run the city. Their influence remains constant regardless of who is mayor. The same streets have to be fixed every 2 years and the potholes always reappear in the same spots. The street gets ripped up for 7 months and most of the time you drive by the lane reductions and no one is even working.